Periodic Inspection - Mitsubishi A1SJH User Manual

10. MAINTENANCE AND INSPECTION
10.2

Periodic Inspection

This section explains the inspection items which are to be checked every six
months to one year. This inspection should also be performed when the equipment
is moved or modified or the wiring is changed.
No. Check item
Ambient
temperature
Measure whit
thermometer and
1 Ambient hygrometer.
Measure corrosive
humidity
gas.
Ambience
Measure voltage
Line voltage
across 100/200 V
2
check.
AC terminal.
Looseness,
Move the module.
play
3
Ingress of
dust or
Visual check.
foreign
material
Loose
terminal Retighten.
screws
Distances
between
4 Visual check.
Solderless
terminals.
Loose
Visual check.
connector
Check battery
status by mounting
5 Battery special auxiliary
relays M9006 and
M9007.
Table 10.2 Periodic inspection
Check point
0 to 55 °C
10 to 90 % RH
There should be
no corrosive gases.
85 to 132 V AC
170 to 264 V AC
The module
should be
mounted securely
and positively.
There should be
no dust or foreign
material in the
vicinity of the PLC.
Connectors should
not be loose.
The proper
clearance should
be provided
between
Solderless
terminals.
Connectors should
not be loose.
Preventive
maintenance
10 - 3
MELSEC-A
Judgement Corrective action
When PLC is used
inside a panel, the
temperature in the
panel is the
ambient
temperature.
Change supply
power.
Retighten screws.
Remove and clean.
Retighten.
Correct.
Retighten
connector
mounting screws.
If battery capacity
reduction is not
indicated, change
the battery when
specified service
life is exceeded.